ToxA, a significant virulence factor involved in wheat spot blotch disease, exists in the Mexican population ofBipolaris sorokiniana

文献类型： 外文期刊

第一作者： Wu, Lei

作者： Wu, Lei;He, Xinyao;Lozano, Nerida;Singh, Pawan K.;Wu, Lei;Zhang, Xu;Zhang, Xu

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关键词： Cochliobolus sativus; PCR; Disease resistance; Triticum aestivum; Tsn1

期刊名称：TROPICAL PLANT PATHOLOGY （ 影响因子：1.488； 五年影响因子：1.675 ）

ISSN： 1983-2052

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收录情况： SCI

摘要： Spot blotch, caused by the pathogenBipolaris sorokiniana, is an important foliar disease of wheat in warm and humid regions worldwide. The fungal virulence factorToxAinteracts withTsn1in wheat and leads to a susceptible reaction.ToxAhas been found inB. sorokinianapopulations of Australia, the USA, and India, and here we report its occurrence in Mexico, based on analysis of a collection of 196 Mexican isolates ofB. sorokiniana. The isolates were collected from experimental stations and farmers' fields in nine states of Mexico, during the period from 1992 to 2017. A PCR assay with theToxA-specific marker was conducted, and the results revealed the presence ofToxAin 20 isolates (10.2%). Culture filtrate infiltration experiments confirmed that all the 20 isolates were able to induce necrosis reaction on Glenlea, a wheat genotype withTsn1. This is the first report on the occurrence ofToxAin MexicanB. sorokinianapopulation, which is key information for breeding wheat for resistance against spot blotch.

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